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A7R3 native ISO: why 100 ISO for stills but 800 required for video?

mwmccune
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mwmccune Newbie

mwmccune

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Great A7R3 has a required video ISO of 800 as a minimum. But stills seem to have a base ISO of 100. So video seems to require at least three stops more light. 

 

Am I understanding this correctly? If so, why the sensitivity difference?

 

Thanks, Mike

 

 

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2xbass Contributor

2xbass

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Posted (edited)

Just found this post with no replies. I just discovered this same limitation myself but I don’t know the answer. My A9 allows me to go down to ISO100 for video so I don’t get it. Quick web searching seems to reveal no information about this at all which seems odd.

Edited by 2xbass
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Chrissie Proficient

Chrissie

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On 6/2/2018 at 4:42 PM, mwmccune said:

Great A7R3 has a required video ISO of 800 as a minimum.

This limitation doesn't exist, if the a7riii user manual can be trusted:

Quote
  • When shooting movies, ISO values between ISO 100 and ISO 32000 are available. If the ISO value is set to a value larger than ISO 32000, the setting is automatically switched to ISO 32000. When you finish recording the movie, the ISO value returns to the original setting.

If you run into an ISO limitation regardless, maybe you have set an "Auto ISO range" limitation. See the "Hint" on this page for details.

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2xbass Contributor

2xbass

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Thanks for the suggestion but on the A7RIII if you try to set the ISO minimum in movie mode it won’t let you set it lower than ISO 800 whereas it does allow you to do in a stills mode. On the A9 you can set the ISO minimum down to ISO 100. Doesn't make sense.

I also don’t know why according to specs I’ve read, that the A9 can oversample 6K to 4K video in crop mode but the A7RIII can only do 5K to 4K. Doesn’t make sense to me when the A7RIII is supposed to have way more megapixels.

Edited by 2xbass
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